Funding for this research was provided by:
the Science Foundation of Capital Medicine Development (2014-2-2171)
Capital Foundation for Clinical Characteristic Applied Research Projects (Z141107002514132, Z181100001718084)
The Digestive Medical Coordinated Development Center of Beijing Municipal Administration of Hospitals (XXZ0404)
Article History
Received: 2 December 2019
Accepted: 27 May 2020
First Online: 5 June 2020
Compliance with ethical standards
:
: I confirm that the information reported above are accurate and Drs. Hong-shan Wei, Li Jiang, Jia-li Ma, Ling-ling He and Ping Li have no conflicts of interest or financial ties to disclose. All of the authors (Jia-li Ma, Ling-ling He, Ping Li, Li Jiang, and Hong-shan Wei) declare no conflicts of interest with regard to the content of this study.
: This retrospective study was approved by the Clinical Ethics Committees of Beijing Ditan Hospital, Capital Medical University (JDLKZ2018-021–01). All patients provided written informed consent in accordance with the Declaration of Helsinki.